JPS58217986A - Navigator on vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-vehicle navigator that displays the current position of a vehicle on a road map.

Conventionally, as a device of this type, there is a "vehicle travel position display device" disclosed in Japanese Patent Application Laid-open No. 55-159299, which includes a distance sensor for detecting the travel distance of the vehicle and a direction sensor for detecting the traveling direction of the vehicle. The driving position of the vehicle is displayed on the road map display surface of the display.

(2) However, unlike μ, this device simply displays the current location on the display screen of the road map, and has the function of providing guidance to a specific point when the current location reaches a specific point. I haven't.

The present invention has been made in view of the above points, and the present invention calculates the current position of the vehicle with respect to traveling based on signals from the distance detecting means and the direction detecting means, obtains coordinate data of the current position, and stores the calculated current position. A designated point indicated by at least an external operation to the indicating means among a plurality of specific points in the specific area displayed on the display surface of a road map based on map data successively transmitted from the means and stored in the storage means. The coordinate data of the following are sequentially outputted from the storage means, the arrival at a specific point is determined based on the successive coordinate data of the indicated point and the coordinate data of the current position, and the guidance information stored in the storage means at the time of arrival determination. To provide an in-vehicle navigator having a function of selectively providing guidance to a plurality of specific points within a specific area in accordance with external instructions, by being configured to provide guidance to designated points based on (3) The purpose is to

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is an overall configuration diagram showing one embodiment.

In Fig. 1, reference numeral 1 denotes a direction detection device as a direction detection means, which includes a direction sensor that detects the X and Y components of the earth's magnetic field according to the direction in which the vehicle is traveling, and a direction sensor that converts the signal from this direction sensor into a digital signal. Equipped with an A/D converter, the X responds to the vehicle's direction of travel.

It generates a Y-component digital signal.

Reference numeral 2 denotes a distance sensor as a distance detecting means, which generates a distance pulse every unit traveling distance of the vehicle (for example, about 39.2 cm). 3 is a reading device that stores map data of multiple districts (including absolute coordinate data of the upper right point of each map) and service information (service point coordinate data, service point label number, service voice generation data). cassette tape 3a as a storage means
The map data and service information for a specific area can be searched and read using a set of .

4 is a software program according to a predetermined control program.
7 "(4) A microcomputer that executes digital arithmetic processing of software, including CPU4aS, ROM4bSRAM4c,
The direction detecting device is equipped with a 110 circuit section 4d, and is activated by receiving a stabilizing voltage from a stabilizing power supply circuit (not shown) which generates a stabilizing voltage of 5V by receiving power from an on-board battery. 1, the distance pulse from the distance sensor 2, the reading signal from the reading device 3, etc., performs arithmetic processing, and displays a map of a specific area, driving route information, etc. It generates display signals. Note that RAM4G is constantly backed up with power from an on-board battery.

Reference numeral 5 denotes a cathode ray tube (hereinafter referred to as CRT) controller, which receives display signals from the microcomputer 4 and individually stores map data, travel route information, and character data for a specific area, and also stores the stored map data and travel route information. It generates a video signal and a synchronization signal for displaying either information or character data on a CRT. Reference numeral 6 (5) is a CRT display device as a display means, which displays a map, driving route, or characters of a specific area on the CRT using a video signal and a synchronization signal from the CRT controller 5. 7 is a touch panel section, and a CRT display device 11
This touch panel is attached to the display surface of No. 6, and when a specific touch area is touched among the 12 divided touch areas provided on this touch panel, a corresponding serial signal is generated.

8 is an amplifier for outputting a signal from the service audio data recorded in the cassette tape 3a to the speaker 9; 10 is an instruction means for manually (external operation) specifying which service information is to be selected; This is the guidance selection switch.

Next, a detailed electrical wiring diagram of the CRT controller 5 shown in FIG. 2 will be explained. 11 is 12°096 Ml
An oscillation circuit that generates an oscillation signal of lz, 12 is an oscillation circuit 1
A dot (6) counter divides the oscillation signal from 1 and generates a 6.048MHz dot timing clock and a 756KIIz character timing clock, and 13 is an instruction from the microcomputer 4 (
command) and the character timing clock from the dot counter 12, horizontal and vertical synchronization signals, display timing signals, refresh memory address signals (No. 8, display controller that generates raster address signals, 14, horizontal and vertical signals from the display controller 13) Based on the synchronization signal, the microcomputer 4 holds a bold signal that causes the microcomputer 4 to hold during the display period.
This is a hold signal generation circuit that is generated at the OLD) terminal.

Reference numeral 15 sends an address signal from the microcomputer 4, a refresh memory address signal from the display controller 13, and a raster address signal to the microcomputer 4.
16, 17, and 18 are bus drivers with a tri-state that switches the data direction between the microcomputer 4 and the display memory, and 19 is an ASCII code from the microcomputer 4, etc. a character memory which stores the display data of and receives a refresh memory address signal from the display controller (7) 13 and outputs its contents as an address;
A character generator 20 outputs a display pattern based on the display address from the character memory 19 and the raster address signal number from the display controller 13. 21 is a first graphic memory that stores map data from the microcomputer 4; 22 is a second graphic memory that stores travel route information (travel trajectory data, current position data) from the microcomputer 4;
23.24.25 is the character generator 20, the first
, a parallel-serial (
P-3) 'lIWAm, 26 switches and displays the reception of signals from the P-+s converter 23 and the p-s converter 24, 25 in order to select the graphic and character screen according to the screen switching signal from the microcomputer 4. The video signal is transmitted by the display timing signal from the controller 13.
(8) The video controller 27 is an exclusive OR circuit that generates a synchronizing signal using the horizontal and vertical synchronizing signals from the display controller 13.

Note that the character memory 19 and the first and second graphic memories 21 and 22 are constantly backed up with power from an on-vehicle battery.

That is, in this CRT controller 5, based on the data sent from the microcomputer 4, character data is stored in the character memory 19, map data is stored in the first graphic memory 21, and display data of the travel trajectory and current position is stored in the second graphic memory 19. Always stored in the memory 22,
The screen switching signal from the microcomputer 4 selects the graphic screen (displaying the travel trajectory and current position on the map) and the character screen (displaying specified characters, etc. to specify the district). The video signal and synchronization signal to display the corresponding screen on the CRT
Display! ! It has occurred on 6.

Further, the touch panel section 7 has three parts as shown in FIG.
It has a tarache (9) rear divided into 12 parts from 1 to 42, and is composed of two pieces of glass and a transparent conductive film formed in a matrix on each glass, so that a specific touch area can be pressed. At times, the touch area is detected by contact with the transparent conductive film of the matrix due to the deflection of the glass, and a touch signal generation circuit (not shown) generates a serial signal (consisting of a start signal and a touch information signal) corresponding to the detected touch area. are doing. Note that this touch signal generation circuit generates touch information at that time in the form of a serial signal every 4 Qmsec.

Furthermore, FIG. 4(b) does not show the data area portion corresponding to one district on the cassette tape 3a. The cassette tape is divided into a left channel and a left channel, and in the right channel (Figure 4 (8)), A stores the absolute coordinates (coordinates relative to the North Pole) of the upper right point of the map of the area and the map number. B is the map data storage section that stores the map data of the area, CO to Ct are the label number storage sections for service points (specific points), and DO to DI are the service point locations (10). The coordinate data storage section stores data, and X is a blank section. In the left tunnel (Fig. 4(b)), C
O to Ci are label number storage sections similar to those shown in (a), EO to Ei are service voice storage sections storing voice data for service points, and X is a blank section. Note that i indicates the number of service points within a specific area, which is 6 in the case shown in FIG. And this A.

F3. By reading parts C, D, and E with the reading device 3, the absolute coordinate data of the specific area, the map number, the map data, the label number of the service point, the coordinate data of the service point, and the coordinate data of the service point are provided to the microcombi 1-4. Audio data can be given.

Furthermore, FIG. 5 shows the guide selection switch 10 shown in FIG.
This is a configuration diagram of a return type up switch 51, a down switch.
It is equipped with a switch 52 and is configured to generate an up signal and a down signal in response to the respective button operations.

The operation in the above configuration is explained in the display explanatory diagram in Fig. 6 and in Fig. 7.
This will be explained with reference to the calculation flowcharts shown in FIGS. 11 to 11 and the calculation explanatory diagram in FIG. FIG. 7 is a calculation flowchart showing the overall calculation processing of the main routine of the microcomputer 4, FIG. 8 is a calculation flowchart showing the calculation processing of the interrupt calculation routine based on the distance pulse from the distance sensor 2, and FIG. FIG. 10 is a calculation flowchart showing detailed calculation processing of the mode calculation routine in FIG. 7, FIG. 10 is a calculation flowchart showing detailed calculation processing of the current position calculation routine in FIG. It is a calculation flow chart that does not show detailed calculation processing of a service calculation routine.

Now, in a vehicle equipped with components 1 to 10 shown in FIG. 1, when a key switch is turned on at the start of operation, each part of the electrical system is activated by receiving power from the vehicle battery. The microcomputer 4 then enters the operating state upon receiving the stabilized voltage of 5V from the stabilized power supply circuit, starts its arithmetic processing at the start step 100 in FIG. 7, and proceeds to the initial setting routine 200. register and color in microcomputer 4.
8. Set the counters, latches, etc. to the initial states necessary to start arithmetic processing. After this initial setting, the arithmetic processing from the mode arithmetic routine 300 to the service arithmetic routine 600 is repeatedly executed at predetermined intervals. .

That is, in this mode calculation routine 300, one of the map mode and the character mode is selected, and the content corresponding to that mode is displayed on CR'r.When in the map mode, the cursor can be moved to indicate the current position, and the character When in the current position calculation routine 400, the current position calculation routine 400 executes calculation processing that enables map designation of a specific area.
Proceed to. In this current position calculation routine 400, the current position data and traveling trajectory data in the second graphic memory 22 in the CRT controller 5 are converted to X.

A calculation process is executed to change the content to a travel change of ±50 m for each Y component, and the process proceeds to a service calculation routine 600. In this service calculation routine 600, when the map mode is selected, the number in the lower right circle displayed on the CRT display device 6 is displayed (13). When the distance between the current location and the service point (the point corresponding to the number in the lower right circle) approaches within 1 km, the service information for that location is stored from the corresponding service voice storage section of the cassette tape 3a. It reads the audio data and executes arithmetic processing to cause the speaker 9 to generate service audio.

When the distance pulse from the distance sensor 2 is applied to the interrupt (INT) terminal of the microcombination unit 1-4 in response to the repeated calculation of this main routine, the microcomputer 4 temporarily suspends the calculation processing of the main routine. The interruption is interrupted and the interrupt arithmetic processing shown in FIG. 8 is executed. That is, the arithmetic processing is started from the interrupt start step 501, and the process proceeds to the integration step 502, where unit distance data (equivalent to about 39.2 cm) is integrated and updated to the distance data D stored in the RAM 4G, and the distance is calculated. Proceeding to determination step 503, it is determined whether the distance data D has reached 6.25 m.

At this time, the distance data D has not reached 6.25 m (1
4) The judgment for the cousin becomes NO and the process proceeds to return step 5IO, but when the distance data D reaches 6.2 j), m, the judgment becomes YES and the process proceeds to the direction signal input step 504. Then, in this direction signal input step 504, digital x, Y component signals) (a
, Ya (east and north are positive directions, west and south are negative directions), and the process proceeds to average direction calculation step 505 to obtain previous direction data X,,Y.

(bearing data before traveling 6, 25 m) and current bearing data Xa, Ya to calculate average bearing data x, Y, proceed to distance component calculation step 506, and proceed to distance component D in the X direction.
Find x as 6.25X/p, where <x/p- is cosθ, Y/, β for the counterclockwise angle θ with the east direction as the reference.
("4-Y'- corresponds to sin θ), storage step 50
Proceed to step 7 and set the current direction data Xa and Ya for next time. , Yo, proceed to distance data reset step 508 to reset distance data D to 0, proceed to distance flag set step 509 to set the distance flag, proceed to return step 510 to return to the temporarily interrupted main routine. do. That is, in this interrupt calculation routine, the distance data D is cumulatively updated every time a unit distance is traveled, and when the distance data D reaches 6.25 m, this 6.25
Calculate the distance components Dx and Dy in the X and Y directions with respect to m,
Executes arithmetic processing to set the distance flag.

Next, mode calculation routine 30 in the main routine
Detailed calculation processing of 0 will be explained. In this mode calculation routine 300, the calculation process is started from a touch data manual step 301 in FIG. 9, and touch data from the touch panel unit 7 is input and stored in the RAM 4c. Then, the process proceeds to map mode determination step 302 and the RAM 4
It is determined whether the contents of the mode area in C are map mode or not, and when it is map mode, the determination becomes YES, and the process proceeds to mode change determination step 303, where RAM 4 is
9' It is determined whether the touch data stored in C is data indicating a mode change (data when the touch area 34 in FIG. 3 is pressed). At this time, if the touch data is data indicating a mode change, the determination becomes YES, the process proceeds to character mode setting step 304, the contents of the mode area are set to character mode, and character switching signal output step 305 is activated. Then, a character switching signal for displaying the character screen on the CR7 display device 6 is generated to the video controller 26 in the CRT controller 5, and one calculation process of this mode calculation routine 300 is completed.

On the other hand, when the touch data is not data indicating a mode change, that is, data when a tag area other than 34 in FIG. 3 is pressed, or data when no other touch area is pressed (e.g. When the data is FF), the determination in the mode change determination step 303 becomes NO, and the process proceeds to the cursor movement determination step 306. In this cursor movement determination step 306, the evening/nochi data is data (currer (
17) Determine whether or not the data for crane movement is), and if the evening/Sochi area is not data for cursor movement) and the determination is NO.
Then, one calculation process of this mode calculation routine 300 is completed. However, if the evening/Sochi data is data for cursor movement, the determination becomes YES and the process proceeds to the cursor movement calculation step knob 307. This cursor movement calculation step knob 307 displays on the CR7 display device 6 that this evening/note data is data for pressing the touch area 32 or 33 according to the touch data. The contents of the second graphic memory 22 in the CRT controller 5 are changed so as to move the cursor a predetermined distance northward, and similarly, if the touch data is data for pressing the touch area 35, the cursor is moved westward by a predetermined distance. If the Sochi data is data for pressing the touch area 40 or 41, the cursor is moved southward, and when the evening/nochi data is data for pressing the touch area 38, the cursor is moved eastward by a predetermined ratio Mf. The arithmetic processing for changing the contents of the second graphics memory 22 (l8) is executed, and one arithmetic processing of this mode arithmetic routine 300 is completed.

On the other hand, if the determination in the map mode determination step 302 is NO.
In this case, the process proceeds to mode change determination step 308, and it is determined whether or not the mode is to be changed using the same arithmetic processing as in mode change determination step 303. At this time, if the determination is YES when changing the mode, the map mode setting step 309
The program then proceeds to set the contents of the mode area of the RAM 4G to the map mode, and then proceeds to a data conversion step 310 to convert the mileage data in the second graphic memory 22 in the CRT controller 5. In this case, first read the reading bag W!
, 3 to search for the designated area using its map number, and calculate the coordinates using the absolute coordinate data on the searched map (stored in the header section A shown in Figure 4) and the absolute coordinate data on the previous map of the area. A conversion value is calculated, and the travel trajectory and current position data in the second graphic memory 22 are converted so as to slide according to the calculated values (R
(The travel trajectory and current position data stored in the AM4C are also converted in the same way.) Then, the process proceeds to a map data reading and outputting step 311, where the map data of the cassette tape 3a is inputted via the reading bag N3 and the map data is outputted to the first graphic memory 21.

Next, the process proceeds to a service point reading step 312, where the label number storage section (Co-Ci) of the cassette tape 3a,
Coordinate data storage unit (reads the service point label number and its corresponding coordinate data from the Do-D port and stores it in RAM
4G, and proceeds to a map graphic screen switching signal output step 313 to generate a map graphic screen switching signal to the video controller 26 for displaying the map graphic screen on the CR7 display device 6, and this mode calculation routine 300 One calculation process is completed. That is, when switching from the character screen to a map graphic screen different from the previous one, the above calculation process is executed, the current map data is stored in the first graphic memory 21, and the current location corresponding to this map is updated with the travel trajectory and the current location. The contents in the second graphic memory 22 are converted so as to modify the cursor indicating the cursor (data on the travel trajectory and current position in the RAM 4C are similarly converted).

As a result, even if the map displayed on the CR7 display device 6 is changed, the travel trajectory and current location can be displayed in the area corresponding to the map.

On the other hand, if the determination in the mode change determination step 308 is NO.
If so, the process advances to character calculation step 314. When this character calculation step 314 is reached, the character mode is set and a character switching signal is being issued to the video controller 26.
The CR7 display device 6 displays a character screen as shown in FIG. The numbers 02-4-68 shown in the center of this character screen are numbers that designate regions, regions, and districts, respectively, and each number is determined by the increment switch 5.
1 is added and updated by 1, and the decrement switch 52
Character operation (21) is performed in step 314 such that the value is updated by one by one at step 314, set at set switch 53, and reset at reset switch 54. Furthermore, this region,
Area and district numerical data, i.e. map numbers, are stored in RAM
It is stored in 4C. In addition, the switch 51 described above is also used.
52, 53, and 54 are touch areas 39 in Fig. 3, respectively.
, 40.41.42.

That is, the mode calculation routine 300 shown in FIG.
Now, the touch data from the touch panel section 7 and the RAM 4
■~ as shown below according to the contents of the mode area in G
Perform the operation described in ■.

- If there is a cursor movement instruction when the map mode is on and the mode is not changed, arithmetic processing for cursor movement is executed, and if there is no cursor movement instruction, the map display is continued as is.

■If there is an instruction to change the mode while in map mode, the map mode will be changed to character mode and the CRT
A character screen is displayed on the display device 16.

■When in character mode and not changing modes, the 6th
It is possible to accept changes to the map (22) on the character screen as shown in the figure.

(2) When a mode change instruction is given while in the character mode, the character mode is changed to the map mode, and the graph ink screen of the map is displayed on the CRT display device 6, and at the same time, the traveling trajectory and current position are also corrected and displayed.

Next, the current position calculation routine 4 in the main routine
The detailed arithmetic processing of 00 will be explained. In this current position calculation routine 400, the calculation process starts at distance flag determination step 401 in FIG. 10, and it is determined in the interrupt calculation process in FIG. 8 whether or not the distance flag is set. At this time, if the distance flag is not set, the determination becomes NO and one calculation process of this current position calculation routine 400 is completed, but if the distance flag is set, the determination becomes YES and Distance correction step 4
Proceed to 02. Then, in this X distance correction step 402, the X distance data DX is corrected using the X distance component Dx obtained by the interrupt calculation process (1) X=DX+Dx)L, .
In the Y distance correction step 403, the Y distance data DY is similarly corrected (DY-DY+Dy) L, and the process proceeds to the first X distance determination step 404, where it is determined whether the X distance data DX has become a value of 50 m or more. do. At this time, if the X distance data DX is a value of 50 m or more, the determination becomes YES, and the process proceeds to the X distance subtraction step 405, where the X distance data D
Subtract the value of 50m from let

Further, the determination in the first X distance determination step 404 is N
If it is O, the process proceeds to the second xim separation determination step 407, and
It is determined whether the distance data X has become a value of 150 m or less. At this time, if the X distance data Dx has a value of 150 m or less, the determination becomes YES, and the process proceeds to the X distance addition step 408, where the value of 50 m is added to the X distance data DX, and the process proceeds to the display movement step 409. Change the current position data in the second graphic memory 22 by 50 m in the negative direction (
(in the west direction), and the travel locus data is also made to follow along with this.

Then, when the judgment in the second X distance judgment step 407 is NO, or after the display movement steps 406 and 409, the process proceeds to the Y component display movement processing routine 410, and the Y distance #
l? Y distance data D calculated in 1i positive step 403
For Y, the same determination as in steps 404 to 409 above,
Execute calculation processing.

(When the Y distance data DY reaches a value of 50 m or more in either the positive or negative direction, the current position data and traveling trajectory data in the second graphic memory 22 are moved by 50 m in the corresponding direction.) Then, the next distance Proceeding to flag reset step 411, the distance flag is reset.

That is, the current position calculation routine 4 shown in FIG.
At step 00, the current position data and travel trajectory data in the second graphic memory 22 are converted regardless of the screen displayed on the CRT display device 6.

Next, the service operation routine (25) 600 in the main routine will be explained. In this service performance W routine 600, the calculation process starts with map mode determination 601. In this map mode determination step 601, it is determined whether or not the content of the mode area in the RAM 4C is in the map mode. If it is not in the map mode, the determination becomes NO and one calculation process of this service calculation routine 600 is completed. , when the map mode is selected, the determination becomes YES and the process proceeds to service point setting step 602. In this service point setting step 602,
The occurrence of an up signal or a down signal from the guidance set switch 10 is monitored, and if either of these signals occurs, the service point) P Increase the value to match the label number.

A calculation process is performed to change the display data in the corresponding area in the second graphic memory 22 so as to change the number in the lower right circle on the CRT display M6 in accordance with the change. Then, the process proceeds to the next two-point calculation step 603 (26), and the coordinate data of the label number (Xp, 8p) for the value of the service point (P) is successively read out from the RAM, as shown in FIG. , current position on the map Nlχw, 4
) J)) and the service voice p)'' (km) are calculated, and the process proceeds to the next l km determination step 604. Note that K is a constant for obtaining Q in km units. In l km determination step 604, it is determined whether the calculated Q is less than or equal to l km, and l k
m or less, the determination becomes YES, and the process advances to audio output step 605, where the audio is stored (recorded) in the service audio storage section of the designated label number among the service audio storage section Eo=Ei of the left channel of the cassette tape 3a. ) is read and reproduced through the reading device 3, and the voice data is outputted to the amplifier 8, and this service calculation routine 600
One calculation process is completed. Therefore, the speaker 9 generates a sound guide for the specific point (for example, sound for railroad crossings, hospitals, sightseeing information, etc.). Note that the distance Q is l
km, the determination in step 604 becomes 'NO' and one calculation process of this service calculation routine 600 is completed.

In the above embodiment, one service point is specified for one map, but a plurality of service points may be set for one map. (In this case, the distance between each designated service point position and the current position is sequentially compared, and when any of the service points is within a predetermined distance, for example, 1 km, a corresponding service sound is generated.) In addition, the display device is not limited to the CRT display device 6, but also liquid crystal, EL
It may be a display device such as.

Further, although the cassette tape 3a is shown as the external storage device, another magnetic disk or the like may be used.

Further, although the direction detection device 1 using geomagnetic detection is shown as the direction detection means, a gyro type device that detects the relative traveling direction of the vehicle may be used instead of geomagnetic detection.

In addition, when determining the arrival at a service point, a system that generates a guidance voice for the service point has been shown, but the guide map data for the service point can be stored in advance on a cassette tape, and the map display up to that point can be displayed when determining the arrival. The service point may be guided by switching the display to a guide map of the service point and notifying the driver of the display change using a buzzer or the like.

Although the control is shown using software from the microcomputer 4, a hard logic configuration using an electronic circuit may also be used.

As described above, in the present invention, the current position of the vehicle is calculated based on the signals from the distance detecting means and the direction detecting means, coordinate data of the current position is obtained, and the calculated current position is continuously stored from the storage means. out of the plurality of specific points in the specific area stored in the storage means, at least the indicated point (( 29) Coordinate data is sequentially read from the storage means, and arrival at a specific point is determined based on the successive coordinate data of the indicated point and the coordinate data of the current position, and the guidance stored in the storage means is determined at the time of arrival determination. Since guidance to the indicated point is provided based on the information, by determining whether or not you have reached a specific point within a specific area based on the coordinate data of your current position and the coordinate data of the indicated point, you can determine which route to the indicated point. Even if the user approaches the designated point, it can be determined that the user has reached the designated point, and therefore guidance to the designated point can be performed reliably, and furthermore, the user can freely designate any one of multiple specified points according to the user's wishes. It has the excellent effect of being able to

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is a detailed electrical wiring diagram of the CRT controller shown in FIG. 1, FIG. 3 is an explanatory diagram showing the touch area of the touch panel section, and FIG. Figures (a) and (b) are explanatory diagrams that do not show the data area of the cassette tape, Figure 5 is a configuration diagram of the guide selection switch (30), and Figure 6 is a display explanatory diagram showing the display state of the CRT display device. , FIG. 7 is a calculation flowchart showing the overall calculation processing of the main routine of the microcomputer, FIG. 8 is a calculation flowchart showing the calculation processing of the interrupt calculation routine based on the distance pulse from the distance sensor, and FIG. A calculation flowchart showing detailed calculation processing of the mode calculation routine in the figure,
Figure 10 is a calculation flowchart showing detailed calculation processing of the current position calculation routine in Figure 7, Figure 11 is a calculation flowchart showing detailed calculation processing of the service calculation routine in Figure 7, and Figure 12 is a service calculation flowchart. FIG. 3 is an explanatory diagram for explaining distance calculation for points. ■...Direction detection device as direction detection means, 2...
Distance sensor as distance detection means, 3a... Cassette tape as storage means, 3... Reading device, 4...
Microcomputer, 5...CRT controller. 6...CRT display device as display means, 8...Amplifier, 9...Speaker, 10...Guidance selection switch. Representative Patent Attorney Takashi Okabe (31) Third Cause Fourth Revenge Figure 5 Figure 6 CA7 Figure 6 Box Unexamined Publication %f 58-21798G (11) Figure 9 Figure 10 Audience Figure 11

Claims (1)

[Scope of Claims] Distance detecting means for detecting the travel distance of the vehicle, direction detecting means for detecting the traveling direction of the vehicle, and detecting the current position of the vehicle with respect to travel based on signals from the distance detecting means and the direction detecting means. In the in-vehicle navigator, the in-vehicle navigator is equipped with a calculation means for calculating the coordinate data of the current position and a display means for displaying the current position calculated based on the signal from the calculation means on a display surface of a road map. a storage means storing map data for displaying a road map of a specific district on a display means, coordinate data of a plurality of specific points within the specific district, and guide information for the specific points; and one of the plurality of specific points. an instruction means for instructing one of the above according to an external operation; and (1) displaying map data of a specific district from the storage means on the display means (1) and storing it in the storage means. Out of a plurality of specific points corresponding to the specific area where the area is located, coordinate data of at least a specific point indicated by the instruction means (referred to as an indicated point) is sequentially outputted from the storage means, and coordinate data of the successively successively indicated points is stored. and means for determining whether the designated point has been reached based on the coordinate data of the current position and generating guidance for the designated point based on the guidance information stored in the storage means when determining the arrival. .